Interposal is valid Scrabble Word

Is interposal a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is interposal valid Words with Friends?
Words with Friends NO

Definitions for INTERPOSAL in dictionary:

Words related to INTERPOSAL

interposals13
Find what other words can be done using letters: "interposal"
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